Hmm....
Ok, this obviously isn't solely for the purpose of inane violence. If it is, it's entirely idiotic, but I don't think it is.
Good concept with the mood shifts and surprises. Animation was ok, sound loops were ok.
But as for the meaning, this person in the movie is obviously really, really bored in class, and really, really violent. Why he's so violent, I don't know. But I do know that I need toothpaste.